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f5F5 Networks has acquired, an 18-month-old startup that helps customers prevent distributed denial-of-service (DDoS) attacks to servers with a cloud-based security product.

The deal will help Seattle-based F5 compliment its software offering, which already includes an existing on-premise DDoS Protection service.

Belmont, Calif.-based was founded in December 2012 and had previously raised $9.5 million.

“F5’s objective is to help protect customers from ever-changing security threats before they impact their businesses,” Manny Rivelo, EVP of Strategic Solutions at F5, said in a statement. “Customers ultimately want a unified solution that seamlessly blocks DDoS attacks at the appropriate network location for the type of threat posed. The appeal of a hybrid F5 solution is that it combines the best of on-premises and cloud-based protection. The highly respected team of security experts from Defense.Net is a welcomed addition to F5.”

Terms of the acquisition were not announced and F5 notes that the deal will not have a “material impact” on its operating results.

F5 most recently posted solid financial results for fiscal second quarter, reporting revenues of $420 million — up 20 percent over the same period last year — and net income of $69.6 million. That was up from $68 million in the prior quarter, and up from $63 million in the same period last year.

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